CN107664825B - Optical system and wide-angle lens - Google Patents
Optical system and wide-angle lens Download PDFInfo
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- CN107664825B CN107664825B CN201711000551.8A CN201711000551A CN107664825B CN 107664825 B CN107664825 B CN 107664825B CN 201711000551 A CN201711000551 A CN 201711000551A CN 107664825 B CN107664825 B CN 107664825B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 70
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000012512 characterization method Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000004075 alteration Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention provides an optical system and a wide-angle lens, comprising: six groups of lenses sequentially arranged from an object side to an image side are arranged along an optical axis, the first lens group and the fifth lens group have negative refractive power, and the third lens group, the fourth lens group and the sixth lens group have positive refractive power; the object side optical surface of the first lens group is a convex surface; the object-side optical surface of the second lens assembly is convex, and the image-side optical surface of the second lens assembly is concave; the image side optical surface of the fifth lens group is a concave surface; f (F) 1 F is the effective focal length of the first lens group 2 N is the effective focal length of the second lens group 5 Refractive index of the fifth lens group, F 5 F is the focal length of the optical system for the effective focal length of the fifth lens group, satisfying the following relation: i F 1 /F 2 |<0.5，N 5 >1.6，|F 5 /F|<2.0. The lens group of the optical system is simple to manufacture, can meet the requirement of a user on ultra-wide angle high brightness of the lens, and can meet the requirement of the user on miniaturization and light weight of electronic products.
Description
Technical Field
The present invention relates to an optical system, and more particularly, to an optical system and a wide-angle lens.
Background
The invention of a new image pickup device (sensor) such as CCD, CMOS, etc. instead of film realizes the digitization of photos and the development and popularization of small mobile devices. With the advancement of technology, the trend of the current electronic products is mainly toward miniaturization and ultra-thinning, such as small or thin digital cameras, web cameras, mobile phone lenses, etc., and high resolution and high imaging quality are the needs of users, but small and thin wide-angle lenses are the urgent needs of users. However, the current wide-angle lens in the market cannot meet the requirements of miniaturization and thinness.
Disclosure of Invention
The invention provides an optical system and a wide-angle lens, which are simple to manufacture, and can meet the requirements of users on ultra-wide angle high brightness of the lens and the requirements of miniaturization, light weight and thinness of electronic products.
The present invention provides an optical system comprising: six groups of lenses sequentially arranged from an object side to an image side are arranged along an optical axis, the first lens group and the fifth lens group have negative refractive power, and the third lens group, the fourth lens group and the sixth lens group have positive refractive power;
the object side optical surface of the first lens group is a convex surface; the object-side optical surface of the second lens assembly is convex, and the image-side optical surface of the second lens assembly is concave; the image side optical surface of the fifth lens group is a concave surface;
wherein F is 1 F is the effective focal length of the first lens group 2 N is the effective focal length of the second lens group 5 Refractive index of the fifth lens group, F 5 F is the focal length of the optical system, and satisfies the following relationship:
|F 1 /F 2 |<0.5，N 5 >1.6，|F 5 /F|<2.0。
in the optical system of the present invention, at least one of the two surfaces of the sixth lens group has a curved shape.
In the optical system of the present invention, at least one surface of the six-group lens is an aspherical surface.
The present invention also provides a wide-angle lens, an optical system of which includes: six groups of lenses sequentially arranged from an object side to an image side are arranged along an optical axis, the first lens group and the fifth lens group have negative refractive power, and the third lens group, the fourth lens group and the sixth lens group have positive refractive power;
the object side optical surface of the first lens group is a convex surface; the object-side optical surface of the second lens assembly is convex, and the image-side optical surface of the second lens assembly is concave; the image side optical surface of the fifth lens group is a concave surface;
wherein F is 1 F is the effective focal length of the first lens group 2 N is the effective focal length of the second lens group 5 Refractive index of the fifth lens group, F 5 F is the focal length of the optical system, and satisfies the following relationship:
|F 1 /F 2 |<0.5，N 5 >1.6，|F 5 /F|<2.0。
in the wide-angle lens of the present invention, at least one of the two surfaces of the sixth lens group is curved.
In the wide-angle lens of the present invention, at least one surface of the six groups of lenses is an aspherical surface.
The lens group of the optical system provided by the invention is simple to manufacture, the distance between the first lens group and the sixth lens group is short, and the requirements of users on ultra-wide angle high brightness of the lens and the requirements of miniaturization and light thinning of electronic products can be met. The lens surface type considers the feasibility of injection molding, and has the advantages of simple mold manufacturing and injection molding production. No additional correction is necessary due to the low distortion characteristics.
Drawings
FIG. 1 is a cross-sectional view of embodiment 1 of the optical system of the present invention;
FIG. 2 is a grid distortion characteristic diagram of example 1;
FIG. 3a is an astigmatic field plot of example 1;
FIG. 3b is a distortion characterization graph of example 1;
FIG. 4 is a cross-sectional view of embodiment 2 of the optical system of the present invention;
FIG. 5 is a grid distortion characteristic diagram of example 2;
FIG. 6a is an astigmatic field plot of example 2;
fig. 6b is a distortion profile of example 2.
Detailed Description
The present invention provides an optical system comprising: six groups of lenses sequentially disposed from an object side to an image side are arranged along an optical axis, the first lens group 1 and the fifth lens group 5 having negative refractive power, and the third lens group 3, the fourth lens group 4, and the sixth lens group 6 having positive refractive power.
The object side optical surface of the first lens group 1 is a convex surface; the object-side optical surface of the second lens group 2 is convex, and the image-side optical surface is concave; the image side of the third lens group 3 is concave; the image-side optical surface of the fifth lens group 5 is concave.
The first lens group 1 and the second lens group 2 satisfy the following relation:
|F 1 /F 2 |<0.5 (1)
wherein F is 1 F is the effective focal length of the first lens group 1 2 Is the effective focal length of the second lens group 2.
The critical value of the formula (1) means that, in the wide-angle lens, since the first lens group 1 has a strong negative refractive power, if the range of the formula (1) is exceeded, the incident angle of the incident light of the remaining lens groups becomes large, which also affects the overall performance of the lens.
The fifth lens group 5 satisfies the following relation:
N 5 >1.6 (2)
wherein N is 5 For the refractive index of the fifth lens group 5, the refractive index of the material of the fifth lens group 5 is defined by equation (2) to be greater than 1.6. When the refractive index of the material of the fifth lens group 5 is 1.6 or less, it is difficult to shorten the distance from the first lens group 1 to the final lens group; when the refractive index of the material of the fifth lens group 5 is greater than 1.6, the distance from the first lens group 1 to the last lens group can be shortened. Further, if a material having a refractive index of 1.6 or less is selected, correction of chromatic aberration is also difficult.
|F 5 /F|<2.0 (3)
Wherein F is 5 F is the effective focal length of the fifth lens group 5, and F is the focal length of the optical system. Equation (3) defines that the ratio of the effective focal length and the overall focal length of the fifth lens group 5 is less than 2. When the ratio of the effective focal length to the overall focal length of the fifth lens group 5 is greater than 2, the curvature of the image-forming side of the fifth lens group 5 becomes large, and correction of distortion aberration and peripheral chromatic aberration becomes difficult.
Further, any one of both faces of the sixth lens group 6 of the optical system of the present invention has at least two curved shapes. At least one surface of the six groups of lenses in the optical system is an aspheric surface.
The aspherical surface is resolved according to the following formula.
In the formula (4), z represents a height loss (SAG), k represents a conic constant, c represents a curvature, and r represents a radial distance. A. B, C, D, E, F, G, H and J are aspherical coefficients.
The invention also provides a wide-angle lens, the optical system is adopted, and the specific structure of the optical system is not repeated here.
The optical system of the present invention will be described with reference to examples:
fig. 1 is a cross-sectional view of embodiment 1 of the optical system of the present invention, the optical system of embodiment 1 being an optical design having a FOV of 120 degrees, a ratio of image height to TTL, i.e. the distance from the first lens group to the image plane, of 1.3. Characterized by an optical light-passing aperture Fno 2.2. Effective focal length F of first lens group 1 1 An effective focal length F of the second lens group 2 of-1.5765 mm 2 An effective focal length F of the third lens group 3 of 4.0512mm 3 An effective focal length F of the fourth lens group 4 of 5.2427mm 4 An effective focal length F of the fifth lens group 5 of 1.4202mm 5 An effective focal length F of the sixth lens group 6 of-1.8962 mm 6 3.6352mm. Table 1 shows the relevant parameters of the optical system of example 1.
Table 2 shows the aspherical coefficient table of example 1.
FIG. 2 is a grid distortion characterization graph of example 1, showing that the TV distortion is less than 3.3% across the field of view of the optical system; FIG. 3a is an astigmatic field plot of example 1; fig. 3b is a distortion characterization graph of example 1, showing a maximum of 2.7% optical distortion across the field of view of the optical system.
Fig. 4 is a cross-sectional view of embodiment 2 of the optical system of the present invention, the optical system of embodiment 2 being an optical design having a FOV of 120 degrees, a ratio of image height to TTL, i.e. the distance from the first lens group to the image plane, of 1.3. Characterized by an optical light-passing aperture Fno 2.2. Effective focal length F of first lens group 1 1 An effective focal length F of the second lens group 2 of-1.5723 mm 2 An effective focal length F of the third lens group 3 of 4.1563mm 3 An effective focal length F of the fourth lens group 4 of 5.1327mm 4 Is 14294mm effective focal length F of fifth lens group 5 5 An effective focal length F of the sixth lens group 6 of-1.9160 mm 6 3.8447mm. Table 3 shows the relevant parameters of the optical system of example 2.
| Face number | Radius of radius | Thickness of (L) | Refractive index and dispersion of glass (Abbe number) | Remarks |
| 1 | -17.59 | 0.82 | 1.535:55.8 | Aspherical surface |
| 2 | 0.90 | 0.52 | Aspherical surface | |
| 3 | 1.45 | 0.41 | 1.64:23.53 | Aspherical surface |
| 4 | 2.87 | 0.35 | Aspherical surface | |
| 5 | -2.91 | 0.57 | 1.544:56.11 | Aspherical surface |
| 6 | -1.54 | 0.1 | Aspherical surface | |
| 7 | Plane surface | 0.1 | Diaphragm | |
| 8 | 2.34 | 0.64 | 1.544:56.11 | Aspherical surface |
| 9 | -1.05 | 0.08 | Aspherical surface | |
| 10 | -2.38 | 0.24 | 1.651:21.52 | Aspherical surface |
| 11 | 2.73 | 0.54 | Aspherical surface | |
| 12 | 1.35 | 0.73 | 1.535:55.8 | Aspherical surface |
| 13 | 3.53 | 0.12 | Aspherical surface | |
| 14 | Plane surface | 0.21 | 1.52:64.16 | Optical filter |
| 15 | Plane surface | 0.56 | Non-ballFlour with a plurality of grooves |
Table 4 shows the aspherical coefficient table of example 2.
FIG. 5 is a grid distortion characterization graph of example 2, showing that the TV distortion is less than 2.2% across the field of view of the optical system; FIG. 6a is an astigmatic field plot of example 2; fig. 6b is a distortion characterization graph of example 2, showing a maximum of 3.6% optical distortion across the field of view of the optical system.
Both embodiments are characterized in that the shape of the second surface of the fifth lens group 5 is an imaging side concave surface, and the refractive index is 1.6 or more. |F in example 1 1 /F 2 The ratio of I is 0.39, example 2 where F is 1 /F 2 The ratio of i is 0.37; ratio of effective focal length to overall focal length |f of fifth lens group 5 in embodiment 1 5 The ratio of the effective focal length to the overall focal length of the fifth lens group 5 in example 2 |F| is 1.54 5 F| is 1.51.
The foregoing description of the preferred embodiments of the invention is not intended to limit the scope of the invention, but rather to enable any modification, equivalent replacement, improvement or the like to be made without departing from the spirit and principles of the invention.
Claims (3)
1. An optical system, characterized by being arranged along an optical axis from an object side to an image side in order comprising:
a first lens group with negative refractive power, wherein an object-side surface of the first lens group is a concave surface;
a second lens element with positive refractive power having a convex object-side surface and a concave image-side surface;
a third lens group having positive refractive power;
a fourth lens group having positive refractive power;
a fifth lens group with negative refractive power, the image-side optical surface of which is concave;
a sixth lens group having positive refractive power;
the angle of view of the optical system is 120 degrees, and the maximum value of optical distortion in all view fields of the optical system is 3.6%;
wherein F is 1 F is the effective focal length of the first lens group 2 N is the effective focal length of the second lens group 5 Refractive index of the fifth lens group, F 5 F is the focal length of the optical system, and satisfies the following relationship:
0.37≤|F 1 /F 2 |＜0.5，N 5 >1.6，1.51≤|F 5 /F|<2.0。
2. the optical system of claim 1, wherein at least one of the two surfaces of the sixth lens group is of a toric shape.
3. The optical system of claim 1, wherein at least one of the six groups of lenses is aspheric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711000551.8A CN107664825B (en) | 2017-10-24 | 2017-10-24 | Optical system and wide-angle lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711000551.8A CN107664825B (en) | 2017-10-24 | 2017-10-24 | Optical system and wide-angle lens |
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| CN107664825A CN107664825A (en) | 2018-02-06 |
| CN107664825B true CN107664825B (en) | 2023-12-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110426828B (en) | 2019-09-06 | 2024-04-23 | 浙江舜宇光学有限公司 | Imaging lens group and imaging device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010243709A (en) * | 2009-04-03 | 2010-10-28 | Ricoh Co Ltd | Wide angle lens and imaging device |
| TW201300872A (en) * | 2012-09-04 | 2013-01-01 | Largan Precision Co Ltd | Monofocal photographing lens assembly |
| CN104793318A (en) * | 2014-01-17 | 2015-07-22 | 大立光电股份有限公司 | Photographing optical lens, image capturing device and vehicular photographing device |
| TWI589924B (en) * | 2016-05-17 | 2017-07-01 | Kinko Optical Co Limited | Wide-angle six-slice lens |
| CN106990503A (en) * | 2016-01-21 | 2017-07-28 | 大立光电股份有限公司 | Capture lens systems, image-taking device and electronic installation |
| CN207473176U (en) * | 2017-10-24 | 2018-06-08 | 辽宁中蓝电子科技有限公司 | A kind of optical system and wide-angle lens |
-
2017
- 2017-10-24 CN CN201711000551.8A patent/CN107664825B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010243709A (en) * | 2009-04-03 | 2010-10-28 | Ricoh Co Ltd | Wide angle lens and imaging device |
| TW201300872A (en) * | 2012-09-04 | 2013-01-01 | Largan Precision Co Ltd | Monofocal photographing lens assembly |
| CN104793318A (en) * | 2014-01-17 | 2015-07-22 | 大立光电股份有限公司 | Photographing optical lens, image capturing device and vehicular photographing device |
| CN106990503A (en) * | 2016-01-21 | 2017-07-28 | 大立光电股份有限公司 | Capture lens systems, image-taking device and electronic installation |
| TWI589924B (en) * | 2016-05-17 | 2017-07-01 | Kinko Optical Co Limited | Wide-angle six-slice lens |
| CN207473176U (en) * | 2017-10-24 | 2018-06-08 | 辽宁中蓝电子科技有限公司 | A kind of optical system and wide-angle lens |
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| CN107664825A (en) | 2018-02-06 |
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